Why error message api on port 21117

[filoucrackeur]

Hello,

Can you explain me this error message ?

why on port 21114 ? did i shoud open it on firewall on my self hosted server?

[root@serveur share]# netstat -ntaup | grep hbb
tcp        0      0 0.0.0.0:21119           0.0.0.0:*               LISTEN      369533/hbbr         
tcp        0      0 0.0.0.0:21115           0.0.0.0:*               LISTEN      369343/hbbs         
tcp        0      0 0.0.0.0:21116           0.0.0.0:*               LISTEN      369343/hbbs         
tcp        0      0 0.0.0.0:21117           0.0.0.0:*               LISTEN      369533/hbbr         
tcp        0      0 0.0.0.0:21118           0.0.0.0:*               LISTEN      369343/hbbs         
udp        0      0 0.0.0.0:35262           0.0.0.0:*                           369343/hbbs         
udp        0      0 0.0.0.0:21116           0.0.0.0:*                           369343/hbbs

cordialy

[rustdesk]

https://github.com/rustdesk/rustdesk/wiki/FAQ#change-id-login-and-web-console